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प्रश्न
The rearview mirror of a motorbike starts vibrating violently at some particular speed of the motorbike, what could be done to stop the violent vibrations.
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उत्तर १
This can be stopped by mounting the engine on such a structure, say steel springs that absorb the vibrations of the engine without communicating them to the frame and in this condition, the rearview mirror attached to the frame will not vibrate violently.
उत्तर २
(i) The frame of a motorcycle along with the rearview mirror is found to vibrate violently when it is driven to a particular speed. This happens when the frame has the natural frequency of vibration equal to that of the piston when the engine is driven at that particular speed.
(ii) This phenomenon is called ‘resonance’. In this phenomenon when a body begins with the natural frequency of the others vibrating body B, then A begins to vibrate violently with the maximum amplitude.
(iii) This can be stopped by mounting the engine on such a structure, say steel springs that absorb the vibrations of the engine without communicating them to the frame and in this condition, the rearview mirror attached to the frame will not vibrate violently.
संबंधित प्रश्न
Define the Resonance phenomenon?
What are mechanical waves?
In following figure shows A, B, C and D are four pendulums suspended from the same elastic string XY. Lengths of pendulum A and D are equal, while the length of pendulum B is smaller and the pendulum C is longer. The pendulum A is set into vibration.
(a) what is your observation? (b) Give reason for your observation.
In following figure shows A, B , C and D represent test tube each of height 20 cm which are filled with water up to heights of 12 cm, 14 cm, 16cm and 18cm respectively. If a vibrating tuning fork is placed over the mouth if test tube D, a loud sound is heard.
- Describe the observations with the tubes A, B and C when the vibrating tuning fork is placed over the mouth of these tubes.
- Give the reason for your observation in each case.
- State the principle illustrated by the above experiment.
A tuning fork of frequency 256 Hz will resonate with another tuning fork of frequency:
The diagram below shows three different modes of vibration P, Q and R of the same string of a given length.
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 |
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| P | Q | R |
- Which vibration will produce a louder sound and why?
- Which vibration will produce sound of maximum shrillness (or pitch) and why?
- What is the ratio of wavelength of vibrations P and R?
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
When the stem of vibrating tuning fork is pressed on a table, the tabletop starts vibrating. These vibrations are definitely an example of ______.
